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bool adj=n [y/n] | adjoint flag (for what=linear)
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bool causal=y [y/n] | if y, neglect non-causal branches of DSR
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int cgiter=10 | number of conjugate-gradient iterations
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float eps=0. | regularization parameter
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string flag= | auxiliary input file name
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string grad= | auxiliary input file name
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int liter=5 | number of line-search iterations
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string mask= | auxiliary input file name
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int niter=5 | number of inversion iterations
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int nloop=10 | number of bisection root-search
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string prec= | auxiliary input file name
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string reco= | auxiliary input file name
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int rect#=(1,1,...) | smoothing radius on #-th axis
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bool scale=n [y/n] | if y, scale gradient before line-search
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float scale0=0.5 | gradient scale max ratio (if scale=y)
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bool shape=n [y/n] | shaping regularization (default no)
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float thres=5.e-5 | threshold (percentage)
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string time= | auxiliary input file name
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float tol=1.e-3 | tolerance for bisection root-search
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bool velocity=y [y/n] | if y, the input is velocity; n, slowness-squared
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bool verb=n [y/n] | verbosity flag
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string what= | what to compute (default tomography)
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